随笔分类 -  《通过例子学习C语言》

通过例子的方式，来理解、学习C语言。
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摘要：限定符的作用是限定变量，而使被限定的变量具有特殊的属性，以达到我们变成的目的。通常有局部变量和全局变量，局部变量定义在函数内被，期生命周期在函数被调用的时间内；而全局变量定义在函数外部，其生命周期，贯穿始终。 接着我们说说，在嵌入式底层开发，常用的限定符：static, volatile, exte 阅读全文
posted @ 2017-05-31 23:25 Micheal_you 阅读(162) 评论(0) 推荐(0)
<C Primer Plus>12 switch and break continue
摘要：REMEBER: 1 continue causes the rest of an iteration to be skipped and the next iteration to be started. 2.break causes the program to break free of th 阅读全文
posted @ 2017-04-04 15:58 Micheal_you 阅读(184) 评论(0) 推荐(0)
<C Primer Plus>11 A Word-Count Program
摘要：#include #include "ctype.h" #define STOP '|' int main(void){ char c;//Initializing long n_char = 0L; int n_word = 0; int n_line = 0; int inword = 0;//This is a flag making sure ... 阅读全文
posted @ 2017-04-04 14:41 Micheal_you 阅读(132) 评论(0) 推荐(0)
<C Primer Plus>10 The Sequence points && and ||
摘要：while((c = getchar()) != ' ' && c != '\n') The first subexpression gives a value to c ,which then is used in the second subexpression. while(x++ < 10 && x + y < 20) The fact that the && operator is... 阅读全文
posted @ 2017-04-03 11:50 Micheal_you 阅读(127) 评论(0) 推荐(0)
<C Primer Plus>9 Introducing getchar() and putchar()
摘要：REMEBER It demonstates a characteristic C programming style combing two actions in one expression. 阅读全文
posted @ 2017-04-03 11:02 Micheal_you 阅读(169) 评论(0) 推荐(0)
<C Primer Plus>8 The if statement
摘要：if (expression) statement 阅读全文
posted @ 2017-04-02 20:31 Micheal_you 阅读(146) 评论(0) 推荐(0)
<C Primer Plus>7 The Comma Operator
摘要：1 #include 2 #include 3 int main(void){ 4 const int FIRST_OZ = 46; 5 const int NEXT_OZ = 20; 6 int ounces, cost; 7 8 printf(" ounces cost\n"); 9 for (ounces = 1, cos... 阅读全文
posted @ 2017-04-02 12:16 Micheal_you 阅读(157) 评论(0) 推荐(0)
<C Primer Pus>6 Using Relational Operators and Exprssions
摘要：REMEBER : You should limit yourself to using only < and > in floating-point comparisons. while(status == 1) is ture. and while(status = 1) is ture ... 阅读全文
posted @ 2017-04-02 11:59 Micheal_you 阅读(175) 评论(0) 推荐(0)
<C Primer Plus>5 Looping while
摘要：REMEBER: A for loop is appropriate when the loop involves initializing and updating a variable, and a while loop is better when the conditions are oth 阅读全文
posted @ 2017-04-02 11:43 Micheal_you 阅读(125) 评论(0) 推荐(0)
<C Primer Plus>4 Pointer Operations
摘要：Remeber: 1 Assignment: you can assign an address to a pionter. Do not dereference an uninitialized pointer..for example, int *pt; *pt = 5.(correct : i 阅读全文
posted @ 2017-03-19 21:29 Micheal_you 阅读(179) 评论(0) 推荐(0)
<C Primer Plus>3 Arguments and Pitfalls of Printf()
摘要：Remeber : 1 C now has a function-prototyping mechanism that checks whether a function call has the correct number and correct kind of arguments . 2 th 阅读全文
posted @ 2017-03-19 18:59 Micheal_you 阅读(143) 评论(0) 推荐(0)
<C Primer Plus >2 Altering Variables in the Calling Function
摘要：int function1(int x); int function2(int *ptr); Remeber: 1 Use the first form if the function needs a value for some calculation or action; 2 Use the s 阅读全文
posted @ 2017-03-19 15:30 Micheal_you 阅读(102) 评论(0) 推荐(0)
<C Primer Plus >1 Constants and the C Preprocessor
摘要：The #define statement can be used for character and string constants,too . The following example are valid: 阅读全文
posted @ 2017-03-19 12:31 Micheal_you 阅读(115) 评论(0) 推荐(0)